I would like to try my crown graphic at sporting events using strobes. The synch speed on the lcurrent lense (Schneider 135/f5.6 is too slow. Do I have any lens choices in that focal range with 250 or faster synchs? How about more "modern" which require a #1 copal shutter? Are they an option?

Have you tried shooting the Xenar at 1/250? Have you checked the shutter to make sure it's set for X and not M? Lens type shutters will sync at all speeds, you may notice an exposure loss at 1/500 and above since it's starting to cut out the output of the flash, but at 250 you should be okay.

One way to check to see if it really is timed properly is to remove the front and rear cells of the lens, put the shutter back on to the camera , attach your synch cord, and put the front standard back as far as it can go--like you are going to put the camera away. Put some cheap out dated B&W film in the back.
Pull the dark slide ,have the apertue wide open The flash should be set on minimum. Now with it facing the shutter--dead on center of the shutter , pull the flash about two feet away and let 'er rip.

Try another one with the flash set as you would in the field. A any kind of neutral density you can find--red filters, polarizer, etc since we will be way over exposed .

The difference between these two is that at low power the duration of the flash is much shorter. While this test is the most accurate, the other test may show that you still have enough light getting through.

You may want to try this test again at low power at 1/100 and 1/500 .

Process the film. If the image is of a nice round circle, then the shutter is synchronized and the flash went off when the shutter is wide open. If you see shadows of the shutter blades coming in from the edges, then you aren't getting the full power of the flash.